anhydrous

IPA/ænˈhaɪ.drəs/
IPA/ænˈhaɪ.drəs/

anhydrous — adjective

  • anhydrouspositive
  • more anhydrouscomparative
  • most anhydroussuperlative

1. describes a chemical substance that has had all water removed from it, either th

1.形容詞C1
釋義

describes a chemical substance that has had all water removed from it, either through heating, drying, or a chemical process, so that no water molecules remain inside its structure.

例句

The chemist dried the compound in an oven to produce an anhydrous sample.

anhydrous + sample: describes a prepared laboratory substance

Farmers inject anhydrous ammonia into the soil as a nitrogen-rich fertiliser before planting corn.

collocation: anhydrous ammonia

同義詞
  • dehydrated

    broader term; can refer to food or living tissue, not limited to chemical compounds

  • waterless

    less technical; used for general contexts (a waterless desert) rather than chemical precision

  • dry

    general-purpose adjective; does not carry the scientific meaning of chemically water-free

反義詞
  • hydrated

    contains water molecules within its chemical structure

  • aqueous

    dissolved in or mixed with water; used for solutions rather than pure substances

用法筆記

Used almost exclusively in scientific and technical writing, especially chemistry, pharmacy, and materials science. The opposite (containing water) is expressed by the prefix 'hydrous' or 'hydrated'.

常見錯誤

❌The desert soil is anhydrous' (meaning simply dry).
✅The anhydrous calcium chloride absorbed all the moisture from the air.
💡'anhydrous' is a precise chemistry term, not a synonym for ordinary 'dry' or 'waterless'.